<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h2>表单分成表单域，表单控件，提示信息</h2>
    <form method="get">
        <p><span>年龄：</span><input type="text" value="" placeholder="请输入年龄"/> </p>
        <p><span>性别：</span><input type="radio" name="sex" value=""/> 男 <input name="sex" type="radio" value=""/>女</p>
        <p><span>年龄：</span><input type="number" value="" placeholder="请输入年龄"/> </p>

        <p><input type="submit"/> </p>
    </form>
</body>
</html>